This intervention will be compared with 2 other weight loss groups; one group will undergo RYGB surgery and one group will undergo LAGB surgery. RYGB is an operation that first divides the stomach into a small upper pouch and a much larger lower "remnant" pouch and then re-arranges the small intestine to connect to both, in this way bypassing part of the small intestine. With LAGB an inflatable band is placed around the upper part of the stomach to create a smaller stomach pouch. This slows and limits the amount of food that can be consumed at one time giving the opportunity for the sense of satiety to be met. It does not decrease gastric emptying time. However, both surgical procedures will proceed as planned and will in no way be changed. Therefore, further explanation is beyond the scope of this protocol.